[pulseaudio-discuss] [PATCH v2 2/2] volume: Add LFE balance API

[Raymond Yau]

>
> The gnome/unity-control-center UIs have a master volume slider, and
> three sub-sliders: balance, fade, and subwoofer. Balance and fade
> use PA's set_balance and set_fade APIs accordingly, but the subwoofer
> slider sometimes does unintuitive things.
>
> In order to make that slider behave better, let's add a LFE balance
> API that these volume control UIs can use instead. With this API,
> the UI can balance between "no subwoofer" and "only subwoofer" with
> "equal balance" in the middle, which would make it more consistent
> with the behaviour of the other sliders.

For snd-hda-intel, LFE volume is slave of virtual master,

do it mean that pulseaudio ignore virtual master playback volume control ?

Since there is no way to distinguish virtual master playback volume from
those AC97 Master Playback Volume , oxygen 's multi channels master
playback volume

It seem that pulseaudio ignore those analog xxx playback volume controls
but treat the virtual master of CA0106 as left channel only

https://bugs.freedesktop.org/show_bug.cgi?id=92690
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